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Finding the Fourth Proportional to 71.28, 106.95 and 42.39

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Solution

The fourth proportional to 71.28, 106.95 and 42.39 is: 63.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.28 : 106.95 = 42.39 : x
  2. Step 2: Convert to fraction form
    71.28/106.95 = 42.39/x
  3. Step 3: Cross multiply
    71.28x = 106.95 × 42.39
  4. Step 4: Simplify right side
    71.28x = 4,533.61
  5. Step 5: Solve for x
    x = 4,533.61/71.28
  6. Step 6: Final answer
    x = 63.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.